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Dear Carlos Faraco Can you tell me how many phase map and magnitude image you used when you use FUGUE to correct EPI distortion? Did you use only one phase map and magnitude image? Thank you. Best wishes Wang Qiang I use FUGUE to correct distortion of EPI too.I found from somematerial that I should measure the field mapping twice: one for the symmetric phase and the other is the asymmetric phase. 2008/3/6, Carlos Faraco <[log in to unmask]>: > > Does anybody have an idea about this? >